BRACHIOPODS. 51 



Productus punctatus (MARTIN). 



Plate xxxvii, tigs. la-c. 



Anomites punctalus Martin, 1809: Petref. Derb., pi. xxxvii, fig. 6. 

 Productus punctatus Sowerby, 1822: Min. Conch., p. 22, pL cccxxiii. 

 Productus semipunctatus Shephard, 1838: Am. Jour. Sci., vol. XX3QV. 



p. 153, fig. 9. 



Productus tubulospinus McChesney, I860: Desc. New Pal. FOBS., p. 37. 

 Productus punctatus Meek, 1872: y. S. Geol. Sur. Nebraska, p. 169. pi. 



2, fig. 6, pi. iv, fig. 5. 

 Productus punctatus White, 1875: U. S. Geol. Sur. W. 100 Merid., vol. 



IV, pt. ii, p. 114, pi. vii, figs. 2a-c. 



Shell large, thin, somewhat ovate; hinge-line considerably 

 shorter than the greatest width of the valves. Ventral valve 

 more or less strongly arched, with a broad shallow mesial 

 sinus; beak incurved; ears not well defined. Dorsal valve 

 slightly concave with a low median ridge. Surface marked by 

 numerous well defined concentric ridges, upon which are ar- 

 ranged many small spines. 



Horizon and localities Upper Carboniferous, Upper Coal 

 Measures: Kansas City. 



Productus costatus SOWERBY. 

 Plate xxxvi, figs. la-c. 



Producta costata Sowerby, 1827: Min. Conch, vol. VI, p. 115, pi. clx. 

 Productus portlockianus Norwood <fc Pratten, 1854: Jour. Acad. Nat. 



Sci., Phila., (2), vol. Ill, p. 15, pi. i, fiss. 9a-c. 



Productus costatus Shumard, 1855 : Geol. Sur. Missouri, Ann. Rep., p. 216. 

 Productus costatus Hall, 1858 : Geol. Sur. Iowa, vol. I, p, 712, pi. xxviii, 



figs. 3, 4. 

 Productus costatus Meek, 1872: U. S. Geol. Sur. Nebraska, p. 159, pi. vi, 



figs. 6a-b. 

 Productus costatus Waite, 1875: U. S. Geog. Sur. 100 Merid, vol. IV., pt. 



ii, p. 109, pi. viii, figs. 2a-d 



Shell much like P. semireticulatus, but rather smaller, less 

 robust, mesial sinus more pronounced, and radiating costse less 

 regular. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



As remarked by Meek this shell has been so generally desig- 

 nated under Sowerby's title, that notwithstanding the perhaps 



